Fix: consider every ROM of a BIOS game to be a BIOS file when merging & splitting

[emmercm]

Fixes: #857

[github-actions]

🧪 Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/merge-split-bios-parent" [commands..] [options]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (e8fd7a3) 93.42% compared to head (66c7a31) 93.11%.

Files	Patch %	Lines
src/modules/datMergerSplitter.ts	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #880      +/-   ##
==========================================
- Coverage   93.42%   93.11%   -0.32%     
==========================================
  Files          86       86              
  Lines        5295     5298       +3     
  Branches     1215     1216       +1     
==========================================
- Hits         4947     4933      -14     
- Misses        330      346      +16     
- Partials       18       19       +1     

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[github-actions]

🔒 Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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